The `is_robot` virtual capability currently looks at several HTTP headers to determine bot traffic, since the User Agent alone can sometimes be deceiving for some bot traffic. I will have to check with the data analytics team in regards to the inclusion of the IAB Spiders & Bots list and will also let you know the response.

In the meantime, would you mind providing any other User Agents that you are having difficulty detecting?

Thank you for reaching out. While I do not have any information about the IAB list being included, I can confirm that the value for is_robot is determined through the data in the WURFL data file as well as heuristics in the WURFL API. Also, do note that a member of our team should be reaching out to you directly to address any further questions or concerns you may have.